回复内容:
@张兵 的说法有一些值得商榷的地方。1. Flash播放器照样能下载,如下图。

3. iPad/iPhone都只支持HTML 5,而不支持Flash。HTML 5配上优雅降级到Flash,其实是最好的做法,Slideshare前一阵已经开始支持HTML 5渲染幻灯片了。
4. 豆瓣没有这么做,确实是国内不支持HTML 5的浏览器用户太多。UPDATE1: 豆瓣电台在IE9下是HTML 5播放器,而Chrome和FF下是Flash。豆瓣在移动端的解决方案是移动App,移动App的效果比移动网页好不少。不过缺点是需要维护多个版本,多个平台。
5. 技术发展很快,没人敢预言5年后的技术主流,更不要说2020年。HTML 5的「首次大规模推广」绝对不是2020!真的到了2020,HTML 5估计已经都要被淘汰了。 HTML 5版的音乐可以将源文件下载到本地,Flash版的下不到。
能下载和不能下载版权费是不一样的。
而且就目前来看,Flash可以做出各种表面效果,各个浏览器里表现基本一致。HTML 5还没成熟到那个程度。
PS:目前不要对HTML 5期待太多,它的首次大规模推广预计在2020年以后。
Update1 : Flash版的资源也是可以下载到的。豆瓣电台在IE9下是HTML5版的,我用chome更改为IE9 UA后可以直接看到链接。见图。

HTML5规范草案将于2012年发布候选推荐版,2022年发布计划推荐版。这摘自《HTML5高级程序设计》,来自图灵的链接: http://www.ituring.com.cn/article/details/1682
更多关于2022的问题,参见这里:http://www.mhtml5.com/2012/03/4653.html
update2:上面说错了,目前HTML5还是非常值得期待的,向下兼容,而且浏览器厂商都在往这方面加油,哪个浏览器出个新版不跑个html5的分数都不好意思。 IE9下是html5的。为啥chrome和firefox上不是,会不会是在这样很容易下载到音乐 我很想知道豆瓣FM做了HTML5的会有啥区别?跳动的动画吗? IE9 的豆瓣电台是 HTML5 的,IE8 以下没有 audio 标签所以肯定要用 Flash 代替的
至于为什么 Firefox 和 Chrome 不采用 HTML5 版本,也许是市场占有率太低,也许有其他原因,这就要问豆瓣了 补充,不是所有浏览器都支持HTML5也是重要原因.国内IE6用户仍不少. 豆瓣电台有html5的播放器...

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